<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
    <style>
        .basic {
            width: 400px;
            height: 100px;
            border: 1px solid black;
        }
        .happy {
            background: red;
        }
        .sad {
            background: green;
        }
        .normal {
            background: grey;
        }
        .atguigu1 {
            font-size: 33px;
        }
        .atguigu2 {
            font-weight: bold;
        }
        .atguigu3 {
            border-radius: 10px;
        }
    </style>
</head>
<body>
    <!-- 

        绑定样式:
            1.class样式
                写法:class="xxx" xx可以是字符串,对象,数组

            2.style样式
                :style="{fontSize: xx}" 其中xx是动态值
                :style="[a,b]" 其中a,b是样式对象
     -->

    <div id="root">
        <!-- 绑定class样式, 字符串写法, 适用于: 样式的类名不确定,需要动态指定 -->
        <div class="basic" :class="mood" @click="changeMood">{{name}}</div> <br> <br>

        <!-- 绑定calss样式,数组写法, 适用于:要绑定的样式个数不确定,名字也不确定 -->
        <div class="basic" :class="arr">{{name}}</div> <br> <br>
        
        <!-- 绑定calss样式,对象写法, 适用于:要绑定的样式个数确定,名字也确定,但要动态决定用不用 -->
        <div @click="changeMood2" class="basic" :class='classObj'>{{name}}</div><br><br>
        <div  class="basic" :class="{atguigu1:true, atguigu2:true}">{{name}}</div><br><br>


        <!-- 绑定style样式 -->
        <div class="basic" :style="styleObj">{{name}}</div> <br>  <br>
        <!-- <div class="basic" :style="styleArr">{{name}}</div> -->
    </div>


    <script>
        Vue.config.productionTip = false
        new Vue({
            el: '#root',
            data: {
                name: '尚硅谷',
                mood: 'normal',
                arr: ['atguigu1', 'atguigu2', 'atguigu3'],
                classObj:{
                    atguigu1: false,
                    atguigu2: false
                },
                fsize: 100,
                styleObj1: {
                    fontFize: '400px',
                    color: 'red',
                },
                styleObj2: {
                    backgroundColor: 'black'
                },
                // styleArr:[]
            },
            methods: {
                changeMood () {
                    // this.mood = 'happy'
                    const arr = ['happy', 'sad', 'normal']
                    const index = Math.floor(Math.random()*3)
                    this.mood = arr[index]
                },
                changeMood2 () {
                    console.log(111)
                    this.classObj.atguigu1 = true
                    this.classObj.atguigu2 = true
                }
            }
        })
    </script>

</body>
</html>